Max schwertfuhrer



(No Model.)

M. SOHWERTPUI-IRER. LOOKING DEVICE FOR PRINTING PLATES.

N0. .614. Patented Sept. 16, 1890.

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UNITED STATES PATENT OFFICE.

MAX SCHVERTFUHRER, OF STUTTGART, GERMANY.

LOCKING DEVICE FOR PRINTING-PLATES.

SPECIFICATION forming part of Letters Patent No. 436,614, datedSeptember 16, 1890..

Application filed May 14, 1890.

To all whom it may concern.-

Be it known that 1, MAX SoHwERTFtiHRER, a citizen of Germany, residingat Stuttgart, Kingdom of Wiirtemburg, Germany, have invented a new anduseful Improvement in Lockin g Devices for Printing-Plates, of which thefollowing is a specification.

My present invention is intended as a substitute for the adjustableclamps heretofore used in printing establishments and which held theplates in place by means of screws. Said invention relates to anarrangement wherein a single light blow upon a headed pin provided forthe purpose suffices to draw the clamp down upon the printing-plate andthe latter upon the bed. The loosening of the clampis effected withequal ease by means of a hooked key.

In the drawings accompanying this specification, Figure 1 represents avertical transverse section, Fig. 2 a vertical longitudinal section,Fig. 3 an end view, and Fig.4. a plan, of a locking device or adjustableclamp embodying my invention; and Figs. 5 and 6 a side elevation andplan, respectively, of a printing surface and bed, showing the saidclamp in position.

The clamp f is attached to a box or shell H, whose bottom is inclinedwith relation to its top. The box or shell H has no lateral walls.Within said shell H there is a wedge K, adapted to slide on its bottom,and which is slightly broader than said bottom, and which, with itsfaces lo, bears laterally against the inclined surfaces of the dovetailgrooves aof the bed .F whenever the wedge K is urged forward upon thebottom of the shell H. This forward movement is effected by pressure ora blow upon the head of the pin S, formed integral with the wedge K andprojecting through the front wall of the shell.

The operation is as follows: When the wedge K is urged forward upon theinclined bottom of shell H in the direction indicated Serial No.351,799. (No model.)

below the upper surface of the bed F, the

grasps the head of the pin 3 to withdraw the wedge K.

It will be noticed that inasmuch as the clamp f extends obliquely to thelength of the shell and the wedge K'the strain upon said clamp andconsequently upon the wedge will not be in the direction of its length,and hence such strain will not act to loosen the platelock. The platewill thus be securely held upon the bed F.

What I claim, and desire to secure by Let ters Patent, is-

1. In a locking device for printing-plates, the combination, with ashell provided with a plate-clamp, of a wedge adapted to slide withinsaid shell, and means for drawing the shell downward upon the forwardmovement of the wedge, all substantially as described.

2. In a locking device for printing-plates,

the combination of a shell having an inclined bottom and provided with aclamp extending obliquely to its length and a wedge adapted to slidewithin said shell, substantially as and for the purposes set forth.

3. In a locking device for printing-plates, the combination, with ashell provided with a clamp and having an inclined bottom, of a wedgehaving lateral wedge-faces and adapted to slide within said shell, and abed having dovetail grooves, substantially as described, whereby thewedge will be caused to bind against the faces of its dovetail grooveswhen urged forward, all substantially as described.

4. A locking device for printing-plates, consisting of a shell H,arranged in the grooves of the bed, open at its sides, and having aninclined bottom, and a wedge adapted to slide on the inclined bottomprovided with a pin 8, whose inclined sides It bear against the inclinedsides of the dovetail grooves a of the bed F when the said wedge isurged forward, 100

and thereby secure the printing-plate on the bed F by the depression ofthe shell H and its clamp.

In testimony whereof I have signed this specification in the presence oftwo subscrib- I05

